Spabk-pluo pboteotor



A. I. JANECEK.

SPARK PLUG PROTECTOR.

APPLICATION man MAY27. 191a.

Patmlted Sept. 16, 1919.

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SP t1 K PLUG PROTECTOR.

specification of Letters Patent. Patented @ept, l6, iota.

Application filed May 2?, 191%. Serial No. Whittle.

To all whom it may concern:

Be it known that l, Anorr J. JANncnK, a citizen of Bohemia, residing at Ely, inthe county of Linn and State of Iowa, have invented certain new and useful Tm rovements in Spark-Plug Protectors; and do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to spark-plugs for explosion engines, more particularly such as are used for automobiles, motor-boats, aircraft, and the, like.

The object of the invention is to provide such plugs with means forpreventing the large breakage of the insulating porcelain, due to accident, or otherwise.

The nature of the invention is fully disclosed in the description and claims following, reference being had to the accompanying drawing, in which Figure 1 is a side elevation of a spark-plug provided with a protective device embodying my invention. Fig. 2 is a central, cross-section of the protective device. Fig. 3 is a plan view of the device, as in use. Fig. 4c is a similar section illnstrating'the application 0% the protector to another type of sparkp ug.

In the drawing, the numeral 1 denotes a spark-plug of a well-known type, in which the porcelain 2 which contains the central pole 3 is secured in place by a screw cap 4. The plug 5 shown in Fig. 42 is of a somewhat difierent type, the porcelain being immovably secured in the body of the plug by swaging, the nature of which is not important to this invention.

Referring to the first three figures of the drawing, it will be seen that the upper, ex-

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posed portion of the porcelain is surrounded by a cage, the members of which are at such a distance from the porcelain as to prevent its being accidentally struck, as by a wrench or other instrument. The cage in this case is formed wlth the screw-cap 4: as a part thereof. This has a six-sided head, and near the, extreme angles thereof are set pins 6. To the upper Lends'of the pins is secured a ring 7 encircling the porcelain near its upper end, "butlow enough so as to be out of contact with the copper terminal of the cable (not shown) To prevent any possible short-cireuiting through the cage it should, to some extent at least, be covered with an insulation 8, of rubber, or the like. This is herein shown covering the ring and pins, though the coating of the u per portions of. the latter is probably su cient, the danger of cross-circuit being of course near where the cable connects with the plug.

This construction is very simple, and being a part of the screw-cap can never become detached. It is evident that the use of a wrench, or the dropping of the plug'on a hard floor, or jarsdue to carriage in a toolbag, will not cause any breakage of the brittle porcelain, which is a very common causeof trouble and expense in connection with the use of spark-plugs.

In the application of the device to the type of spark-plugs shown in Fig. A, a cap 9 is provided, fitting over the hexagonal part of the plug for some distance, but with room below for a wrench, and in this cap the lower ends of the pins are secured. A small setscrew 10 holds the cap in place.

Having thus described my invention, T claim: p

l. A protective open cage for the exposed porcelain of a spark-plug, the same surrounding such porcelain at a distance therefrom, and to near the upper end thereof below the wire connection, and being suitably attached to the body of the plug.

2. A protective cage for the exposed part of a spark-plugs porcelain, the same being composed of the screw-cap securing the porcelain in place, a series of pins attached thereto, and a ring connecting with the other- All tening screw-cap, attached pins, a ring connecting with the upper ends of the pins, and

a coating of insulating material to protect said ring and pins against short-circuiting.

4. A protective cage for spark-plug porcelains, comprising a. cap attachable to the.

plug, a series of pins connecting therewith, and a ring connecting the pins at the opposite ends. a In testimony whereof I a my signature in presence of two witnesses.

ADULF J. JANECEK. Witnesses:

A. T. @oornn, J. All. it. Jenna.

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